Met-Etch is a powerful acid etching gel for dental alloys including non-precious and some precious alloys. It chemically etches away certain elements in the alloy to create voids and undercuts, thereby increasing bond strength with the composite resin. Met Etch can be used wherever a stronger bond is desired, such as the wings of a Maryland Bridge, or a crown that needs to have composite bonded to it. Packaged in a 15cc bottle. Made in the USA.